$329 Cheap Flights from San Luis Potosi (SLP) to St. Louis (STL)

View $329 flight on Tue, Oct 21, 2025Opens in a new window

Popular airlines from San Luis Potosi Intl. Airport (SLP) to St. Louis Lambert Intl. Airport (STL)

Cheap Flights from San Luis Potosi to St. Louis (SLP-STL)

Prices were available within the past 7 days and start at $329 for one-way flights and $540 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Aeromexico
Thu, Oct 23 - Thu, Feb 19
SLP
San Luis Potosi
STL
St. Louis
$540 Roundtrip, found 3 days ago
$540
Roundtrip
found 3 days ago
Select Aeromexico flight, departing Thu, Oct 23 from San Luis Potosi to St. Louis, returning Thu, Feb 19, priced at $540 found 3 days ago
Aeromexico
Thu, Oct 23 - Fri, Feb 20
SLP
San Luis Potosi
STL
St. Louis
$561 Roundtrip, found 3 days ago
$561
Roundtrip
found 3 days ago
Select Aeromexico flight, departing Thu, Oct 23 from San Luis Potosi to St. Louis, returning Fri, Feb 20, priced at $561 found 3 days ago
Aeromexico
Thu, Oct 23 - Fri, Feb 20
SLP
San Luis Potosi
STL
St. Louis
$643 Roundtrip, found 3 days ago
$643
Roundtrip
found 3 days ago
Select Aeromexico flight, departing Thu, Oct 23 from San Luis Potosi to St. Louis, returning Fri, Feb 20, priced at $643 found 3 days ago
Aeromexico
Sat, Oct 25 - Fri, Feb 20
SLP
San Luis Potosi
STL
St. Louis
$664 Roundtrip, found 3 days ago
$664
Roundtrip
found 3 days ago
Select Aeromexico flight, departing Sat, Oct 25 from San Luis Potosi to St. Louis, returning Fri, Feb 20, priced at $664 found 3 days ago
Aeromexico
Mon, Oct 20 - Fri, Feb 20
SLP
San Luis Potosi
STL
St. Louis
$686 Roundtrip, found 3 days ago
$686
Roundtrip
found 3 days ago
Select Aeromexico flight, departing Mon, Oct 20 from San Luis Potosi to St. Louis, returning Fri, Feb 20, priced at $686 found 3 days ago
Aeromexico
Mon, Oct 20 - Fri, Feb 20
SLP
San Luis Potosi
STL
St. Louis
$691 Roundtrip, found 3 days ago
$691
Roundtrip
found 3 days ago
Select Aeromexico flight, departing Mon, Oct 20 from San Luis Potosi to St. Louis, returning Fri, Feb 20, priced at $691 found 3 days ago
Aeromexico
Mon, Oct 20 - Fri, Feb 20
SLP
San Luis Potosi
STL
St. Louis
$712 Roundtrip, found 3 days ago
$712
Roundtrip
found 3 days ago
Select Aeromexico flight, departing Mon, Oct 20 from San Luis Potosi to St. Louis, returning Fri, Feb 20, priced at $712 found 3 days ago

Find the cheapest month to fly from San Luis Potosi (SLP) to St. Louis (STL)

October is typically the cheapest month to fly

From $388 - $787 per traveler.

Frequently asked questions

How much does a flight from Ponciano Arriaga Intl. Airport (SLP) to Lambert-St. Louis Intl. Airport (STL) cost?
Get a cheap one-way flight from $329 or cheap return flight from $540 from Ponciano Arriaga Intl. Airport (SLP) to Lambert-St. Louis Intl. Airport (STL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Ponciano Arriaga Intl. Airport (SLP) to Lambert-St. Louis Intl. Airport (STL)?
The cheapest month to fly from SLP to STL is October, when there's less demand. Off-peak season is usually when airlines offer better prices between these airports.
What is the cheapest airline that flies from Ponciano Arriaga Intl. Airport (SLP) to Lambert-St. Louis Intl. Airport (STL)?
To find the cheapest airline flying from SLP to STL, use Expedia's filter tool. Tailor your search based on your travel needs, such as preferred carriers and seat class. You can then sort your results by "Price (lowest to highest)" to see the cheapest flights first.
How many flights per day from Ponciano Arriaga Intl. Airport (SLP) to Lambert-St. Louis Intl. Airport (STL)?
There aren't any daily direct flights available from Ponciano Arriaga Intl. Airport (SLP) to Lambert-St. Louis Intl. Airport (STL). But you can opt for flights with layovers. Filter your search on Expedia to include one or more stops, and you'll be on your way in no time at all.
What day of the week has the most flights from SLP to STL?
You'll typically find Tuesday the quietest day for flights, while Fridays are often the busiest.* However this can vary from season to season and during public holidays or peak travel times.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Ponciano Arriaga Intl. Airport (SLP) to Lambert-St. Louis Intl. Airport (STL)?
To avoid potential delays on the Ponciano Arriaga Intl. Airport (SLP) to Lambert-St. Louis Intl. Airport (STL) route, travel before 3 PM. Flights after this time have a 22% higher chance of cancellation.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Ponciano Arriaga Intl. Airport (SLP) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Last-minute bookings from SLP to STL are typically more expensive. For the best prices, start searching for flights early. That said, if you're flexible with your travel plans, it's possible to land a cheap fare right before you leave.
Is it cheaper to book a SLP to STL flight and hotel package?
Opting for a SLP to STL flight and hotel package is typically cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels in one place. Select from our impressive range of accommodations and then add activities, flights and car rentals to your booking. Bundle it all together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Ponciano Arriaga Intl. Airport (SLP) to Lambert-St. Louis Intl. Airport (STL)?
In most instances, you can reschedule or cancel your SLP to STL flight. However, additional charges may apply, especially if you made your booking more than 24 hours ago. Check your itinerary for the airline's guidelines and fees on flight changes, or if you want further details, head to our Customer Service portal.

Travel information

Travel information

Origin airport
Ponciano Arriaga Intl.
Destination airport
Lambert-St. Louis Intl.
Roundtrip price
$540
Distance
1299 mi

Book with confidence

Book with confidence

San Luis Potosi to St. Louis Flights

The cheapest times to fly from San Luis Potosi to St. Louis

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from San Luis Potosi to St. Louis are during the month of October. You can find some of the cheapest flights from San Luis Potosi to St. Louis with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from San Luis Potosi to St. Louis

Sunday is one of the best days to book for cheap flights from San Luis Potosi to St. Louis: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from San Luis Potosi to St. Louis

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from San Luis Potosi to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $329 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap San Luis Potosi to St. Louis flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your San Luis Potosi to St. Louis airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

San Luis Potosi to St. Louis Flights

Explore a world of travel with Expedia

Explore a world of travel with Expedia

*Available to One Key members.